This paper evaluates the crop diversification natures in terms of the variations in cropping pattern with respect to land and productive resource distribution. Both the aspects of acreage and production, it is detected that with the time span of last three decades the cropping pattern in West Bengal is progressively lead by paddy both aus and boro, rapeseed and mustard jute, potato. Pulses crop as a total, have lost both in terms of area and productivity in West Bengal. The Technical efficiency (TE), allocative efficiency (AE) and economic efficiency (EE) are evaluated with the help of DEA software under the conjecture of Variable returns to scale and (Table 9.1). The EE scores for crops grown under rainfed condition range from 0.03 in the case of cowpea to 0.85 for Sugarcane. The TE scores for rainfed condition ranged from 0.46 in the case of cowpea to 0.98 in the case of Sugarcane. The EE scores for crops grown under irrigated condition range from 0.10 in the case of red gram and green gram to 0.57 for Paddy. The TE scores for irrigated condition ranged from 0.41 in the case of greengram to 0.97 in the case of paddy.