Abstract: Gas hydrate is quite rich in offshore Pakistan. In order to pursue the occurrence of gas hydrate, multiple channel seismic survey was deployed. The data, however, was unconventional due to the acquisition environment which is only 1.2 fold and short in cable, rich in serious cable noise and of missing data sometimes. Therefore, the data need a special flow for processing. The key principle of data processing is to transform the unconventional seismic data processing into the conventional. Both the parameters of the module and the combination of the flow might be changed for conventional data processing. The key point is to increase the signal to noise ratio and the flow, including anomalous amplitude attenuation, missing data interpolation, adjacent CMP gather summation and migration. The processed section may satisfy the requirements of gas hydrate exploration.