The invention provides a method for self-adaptive adjustment on symbol occupation amount of a PDCCH (Physical Downlink Control Channel). The method comprises the following steps of: A, periodically detecting the degree of satisfaction to cell service within a period of time; B, judging whether the degree of satisfaction to the cell service is lower than a first threshold, and if so, executing a step C, otherwise, returning back to execute the step A; C, calculating the occupation rate of cell bandwidth resources, judging whether the occupation rate of the cell bandwidth resources is lower than a second threshold, and if so, executing a step D, otherwise, executing a step E; D, increasing the symbol occupation amount of the PDCCH, and returning back to the step A; E, acquiring the quantity of current system users, and judging whether the user quantity is lower than a third threshold, and if so, executing a step F, otherwise, returning back to the step A; and F, reducing the symbol occupation amount of the PDCCH, and returning back to the step A.