A method for optimizing network coverage and capacity, comprising: a NodeB judging whether there is a coverage and capacity problem based on set threshold parameters for collected coverage and capacity optimizing data, and if yes, the NodeB determining a solution strategy according to the existing coverage and capacity problem and the coverage and capacity optimizing data causing the problem; if the NodeB can not determine the solution strategy or can not learn whether the determined solution strategy is performable, or the determined solution strategy needs to adjust the parameters of other peer NodeBs, the NodeB sending a coverage and capacity optimization judgment request to a network management node; according to the coverage and capacity optimization judgment request, the network management node performing the optimization judgment, sending a coverage and capacity optimization command to relevant NodeBs; wherein, when the NodeB cannot learn whether the determined solution strategy is performable, the NodeB requesting the network management node to judge a performability of the solution strategy via the coverage and capacity optimization judgment request; the network management node comparing the solution strategy with cell constraint relationship set by the network management node itself, if the above solution strategy is performable, sending the coverage and capacity optimization command to the NodeB to inform the NodeB that the solution strategy is performable; when the solution strategy determined by the NodeB needs to adjust the parameters of other peer NodeBs, the NodeB requesting the network management node to adjust the parameters of the other peer NodeBs via the coverage and capacity optimization judgment request; according to the coverage and capacity optimization judgment request, the network management node locally checking whether the peer NodeBs can adjust the parameters, and if yes, sending the coverage and capacity optimization command to the peer NodeBs. a NodeB judging whether there is a coverage and capacity problem based on set threshold parameters for collected coverage and capacity optimizing data, and if yes, the NodeB determining a solution strategy according to the existing coverage and capacity problem and the coverage and capacity optimizing data causing the problem; if the NodeB can not determine the solution strategy or can not learn whether the determined solution strategy is performable, or the determined solution strategy needs to adjust the parameters of other peer NodeBs, the NodeB sending a coverage and capacity optimization judgment request to a network management node; according to the coverage and capacity optimization judgment request, the network management node performing the optimization judgment, sending a coverage and capacity optimization command to relevant NodeBs; wherein, when the NodeB cannot learn whether the determined solution strategy is performable, the NodeB requesting the network management node to judge a performability of the solution strategy via the coverage and capacity optimization judgment request; the network management node comparing the solution strategy with cell constraint relationship set by the network management node itself, if the above solution strategy is performable, sending the coverage and capacity optimization command to the NodeB to inform the NodeB that the solution strategy is performable; when the solution strategy determined by the NodeB needs to adjust the parameters of other peer NodeBs, the NodeB requesting the network management node to adjust the parameters of the other peer NodeBs via the coverage and capacity optimization judgment request; according to the coverage and capacity optimization judgment request, the network management node locally checking whether the peer NodeBs can adjust the parameters, and if yes, sending the coverage and capacity optimization command to the peer NodeBs.