Abstract: Conceptual development scheme is the key in the economic evaluation of trap. Its design method is basically mature. How to scientifically and reasonably determine the conceptual scheme parameters is the core issue. Due to limited geological parameters in the economic evaluation of trap, it can not meet the design requirements of a development plan in the usual sense. Therefore, the conceptual development scheme is mainly based on the statistical analogy of similar developed areas or similar developed oil and gas reservoirs, or by empirical evaluation. In various target evaluation, the workload is large and the deviation is obvious, which affects the reliability of evaluation result. The prediction models and parameters for three key parameters including oil production rate, well pattern density and production decline rate in the conceptual scheme were established based on the study of the relationship between geological trapping parameters of oil and gas and the conceptual development scheme. Two typical examples were selected, namely, Shengtuoyong 559 South and Chengbei 313 South Paleozoic buried hill traps for application calculation. The calculation results are in good agreement with production practice. This key parameter determination method has good practicability for sandstone oil and gas reservoirs in East China. However, for the western carbonate fractured-and-vuggy reservoirs, due to the large difference in reservoir seepage characteristics, the applicability is relatively insufficient and needs to be further studied.