NOVELTY - Measuring hydrogen exit and output temperature comprises collecting various information for predicting in low temperature state; building artificial neural network controller (10) including output layer (16) having one output node and hidden layer (14); inputting intake temperature of cooling water which means intake temperature of cooling water; and printing out hydrogen exit predicted temperature in which when input variable information inputted to hidden layer (14) of artificial neural network controller (10) is compared with information, error is outputted through output layer (16).    USE - Method for measuring hydrogen exit and output temperature.    DETAILED DESCRIPTION - Measuring hydrogen exit and output temperature comprises:    (A) collecting various information for predicting in low temperature state having outside low air temperature;    (B) building artificial neural network controller (10) including output layer (16) having one output node and hidden layer (14) having hidden node and input layer (12) having input node;    (C) inputting intake temperature of cooling water (n) which means intake temperature of cooling water (n-1) of 1 pyroelectricity, intake temperature of cooling water (n-2) of 2 pyroelectricity, stack current, hydrogen exit predict temperature (n-1) of 1 pyroelectricity, and hydrogen exit predict temperature (n-2) of 2 pyroelectricity coolant temperature at cooling water inlet of stack as input variable obtained in input node of input layer (12) of artificial neural network controller (10) with information gathering; and    (D) printing out hydrogen exit predicted temperature in which when input variable information inputted to hidden layer (14) of artificial neural network controller (10) is compared with information which becomes already with map data, error is outputted through output layer (16).    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of measuring hydrogen exit and output temperature.    Artificial neural network controller (10)    Input layer (12)    Hidden layer (14)    Output layer (16)