Reading the Order Book: How to Understand Depth Charts and See Buy/Sell Power Clearly

Have you experienced this: watching prices rise steadily, thinking the trend is strong, then chasing in — but after buying, price immediately drops? Or seeing massive sell orders stacked up and not daring to buy, then those sell orders suddenly消失 and price jumps up? These happen because you only looked at price, not the order book. The order book and depth chart are market power’s “透视镜” — learning to read them lets you see one step further than others.

What Are Order Books and Depth Charts?

Order Book (list of all unfilled limit orders) displays all current buyer and seller pending orders. It’s split into two halves:

• Bids (buyer orders): Red area, showing at what prices and quantities people are willing to buy
• Asks (seller orders): Green area, showing at what prices and quantities people are willing to sell

Depth Chart (graphical visualization of order book data) is the order book’s visual version. Usually left side is bids (red curve), right side is asks (green curve), the intersection point is current market price.

How to view depth chart on Gate.io:

1. Open any coin’s trading page
2. Find the “Depth Chart” area in the right panel
3. You’ll see a mountain-like shape — left red, right green
4. Bottom axis is price, vertical axis is order quantity

4 Steps to Read Depth Charts

Step 1: Compare Both “Mountains” Heights — Judge Who’s Stronger

Depth chart bids and asks look like two mountains. Higher mountains mean more pending orders on that side.

Bid mountain > Ask mountain: Buyer power is stronger, support (price zone where buyers willingly buy large amounts) is thick, price leans upward or不容易 dropping.

Ask mountain > Bid mountain: Seller power is stronger, resistance (price zone where sellers willingly sell large amounts) is thick, price leans downward or不容易 rising.

Practical case: BTC current price 68,000

• Bids accumulate 150 BTC in 67,000-68,000 range
• Asks only have 40 BTC in 68,000-69,000 range
• Conclusion: Buyer power明显 dominates, strong support near 68,000, short-term bullish

Note: This only shows current power balance — market can change随时. Depth charts tell you “current situation,” not predict future.

Step 2: Look at Mountain Peaks — Find Key Price Levels

Depth charts aren’t smooth slopes — they have “spikes” and “valleys.” Spikes represent large order quantities at specific prices — these are key support or resistance levels.

Bid spike (特别 large buy order quantity at a price) = Strong support

• If price drops here, it encounters大量 buy orders,不容易 breaking below
• But if it actually breaks, seller power is极强, may accelerate decline

Ask spike (特别 large sell order quantity at a price) = Strong resistance

• If price rises here, it encounters大量 sell orders,不容易 breaking above
• But if it actually breaks, buyer power is极强, may accelerate rise

Practical steps:

1. Find the most prominent spikes on both bid and ask sides
2. Remember these two price levels
3. When price approaches spike levels:
   • Near bid spike → consider buying (support protection)
   • Near ask spike →暂时 watch (resistance pressure)

Step 3: Compare Order Quantity with Recent Trading Volume — Judge Authenticity

Orders visible in the book aren’t all real. Some are fake orders (Wall — deliberately placing large orders to mislead other traders,实际 won’t execute), also called “iceberg orders” or “fake walls.”

3 signals for identifying fake orders:

1. Suddenly appearing then suddenly消失: 500 BTC sell order appears at a price, then canceled minutes later → likely fake, aiming to create “heavy sell pressure” illusion, scaring away buyers
2. Massive orders far from market price: Current 68,000, suddenly 1,000 BTC sell at 72,000 → too far from market, basically won’t execute, purpose is creating psychological resistance
3. Placed but never executed: Large order at a price exists long-term, but canceled when price reaches → most典型 fake order behavior

Practical response:

• When seeing massive orders, first observe if they stably exist (only worth attention after 30+ minutes without消失)
• Compare with 24h volume: If某 price’s order quantity > 10% of 24h volume, it may be fake (too large, real traders won’t place so much at once)
• When price逼近 massive orders, observe if they’re canceled — if yes, fake order, price may break through

Step 4: Watch Order Book Change Speed — Judge Market Sentiment

Order book pending orders constantly change. Buy orders被 eaten means someone is buying; sell orders被 eaten means someone is selling. Change speed reflects market sentiment intensity.

Bids quickly被 eaten: Large aggressive buying (using market orders taking pending orders), strong buyer sentiment, short-term bullish. You can see bid curve rapidly shrinking on depth chart.

Asks quickly被 eaten: Large aggressive selling (using market orders taking pending orders), strong seller sentiment, short-term bearish. Ask curve rapidly shrinking.

Both sides quiet: Market hesitating, waiting for direction choice. Directional trades not recommended at this time.

Practical技巧:

• On Gate.io trading page, you can see order book real-time updates
• Note the “Recent Trades” list — see if trades are mainly red (aggressive sells) or green (aggressive buys)
• If 8 of last 10 trades are green (aggressive buys), buyer主导, short-term leans bullish

3 Practical Trading Strategies Using Depth Charts

Strategy 1: Place Limit Buy Orders Near Bid Spikes

1. Find the largest bid spike price level on depth chart
2. Place limit buy order 1%-2% above that price
3. If price drops near the bid spike,大量 buy orders form support — your buy price has a safety cushion
4. Set stop-loss 2% below spike price

Strategy 2: Set Take-Profit Near Ask Spikes

1. Find the largest ask spike price level on depth chart
2. Place take-profit sell order 1%-2% below that price
3. Price rising near ask spike encounters resistance — taking profit before resistance is稳妥
4. If resistance breaks through, re-evaluate whether to continue holding

Strategy 3: Reverse Trade After Identifying Fake Orders

1. Discover massive sell order at a price is fake (frequently canceled)
2. Fake order creates false resistance, scaring away other buyers
3. When fake order is canceled, real resistance is actually smaller than it看起来
4. Can consider buying after fake order消失 — real resistance is underestimated

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Order books and depth charts aren’t future-prediction tools, but透视镜 for seeing the present. They tell you who’s buying, who’s selling, who’s stronger, where support lies, where resistance stands. As a beginner, spending 10 seconds glancing at depth chart before each order helps avoid many impulsive trades. Remember: seeing a bit more than others means losing a bit less.

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