In wireless sensor node battery power and memory is available in limited amount. The computing devices available in the sensor nodes are not capable enough to execute complex algorithm. Moreover, several retransmissions of data packets are done to compensate lost packet due to buffer overflow. The algorithm of buffer management policies of conventional data network cannot be applied in sensor network, because they are too complex to be implemented in low computation capable sensor nodes. There are many aspect of this paper, firstly we proposed to classify the packets into different categories and then we proposed the prioritized buffer management policy for different category uniquely. Currently, the CMU priority queue system available with the default DSR algorithm is being used in wireless sensor network. Our analysis and simulation studies show that our policies can be used to save all critically important packets. The other results indicate that our proposed algorithm outperform the CMU priority queue management available with DSR protocol.