The invention provides a distribution type CDMA network media access control method with controllable power. When a node has data to send, a public code is used for sending RTS grouping, a receiving node uses the public code for receiving RTS grouping sent by the sending node, signal-noise ratio of the grouping is counted, if signal-noise ratio is higher than or equal to threshold signal-noise ratio, the receiving node feeds back power control information to the sending node through CTS grouping; on the other hand, the receiving node does not loop-back CTS grouping, the sending node adds transmitted power for re-transmitting RTS grouping. The sending node adjusts transmit power for transmitting data grouping to the receiving node after receives CTS grouping. The receiving node replies confirming ACK grouping after receives data grouping. When network node has no data to send, the public code is used for receiving control grouping, and corresponding treatment is processed according with received control grouping type. Under the condition of not increasing node hardware cost, the method provide by the invention can reduce average transmit power of network node, and increase space multiplexing degree of network, furthermore, network throughput is increased.