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It’s acknowledged that the problem of the scarcity of space resource is getting more and more serious since there is too much space junk floating in the orbits. If orbital debris couldn’t be removed in time, there would be a collision between operational spacecraft and orbital debris every 5 to 9 years on average and the situation will go from bad to worse over time. Firstly, this paper picks out five removal methods with the highest feasibility and reliability. These five methods have the ability to clean space junk in different heights near-earth orbit, and in a few years these will become the mainstream methods to make the space cleaning. Secondly, the article develops a short-term Comprehensive Evaluation Model depended on operations research, economic and risk analysis. It takes Cost, Time and Risk Probabilistic into consideration while calculating the Values. Then the article gets each factor’s weight by the Entropy Method and figures out the Values according to the modified Cobb-Douglas Production Function. Since the model uses Negative indicator to calculate but considering that it’s widely believed that the higher the Value is, the better. The article takes the reciprocal of the Value as the result. Therefore, we can derive the optimal method to deal with the emergency.

Cobb-Douglas Function, evaluating the best five active removal methods of space junk