: How does a market order actually get filled? If I have a buy market order, there are three selling orders as follow: Sell limit order @ Sell limit order @ Sell @ market order How will my order get filled?

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A market order does not "enter" the Order Book.
It is either instantly matched with an existing Limit Order, or Rejected.
Therefore, by the time time you submit your "buy market order", the "Sell @ market order" does not exist in the Order Book.
The only exception is Opening/Closing auction, in which both Buy Market Order and Sell Market Order can exist at the same time right before Opening/Closing. The price is determined by other Limit Orders that result in maximum volume transacted.