Model I, using computer to search, gets better result, to the second question, Modle II is established to reach the optimum design of working procedure by introducing profit function and analyzing the loss cost, and to the third question, predicting control is adopted ,so the working procedure is well improved.

Assuming that the stock pricing process is geometric brownian motion and consequently on expiry the stock price follows logarithmic normal distribution,this paper discusses the probability of the long position butterfly investors profiting and mathematical expectation of its profit function.

In this paper,under the assumption that the price of the underlying assets at expiration date obeys a normal distribution, we discuss both the probability for purchasers of option combination to get profit and the mathematical expectation of its profit function.

On the basis of these, a rational sequence of these ten measures has been given out according to urgency index, benefit index, and advanced index.