In this paper,we consider of fire spread between wooden buildings.The relation between bumt area (Alm21)and time(x【minl)is approximately S−curve.Former theories are not able to estimate real fire spread condition correctly.As the most appropriate expression,we examine the polynominal and logistic curve.By the method of MAICE,degree of the optimal polynominal is shown three.But the polynominal is not fit for real fire spread phenomenon because it is not always monotone function.On the other

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... we suggest that the function of logistic curve is good enough to explain the fire spread phenomenon.And by modifying the logistic curve,real fire spread phenomenon is shown more correctly。