The relationship between ship equipment maintenance cost and price change was determined， through analysis of price chance effect on ship maintenance cost. By econometric models， based on the producer price index and different type of ship maintenance cost time series data， the influence law of price change on ship maintenance cost was studied and the stable equilibrium between sample data was tested by Augment Dickey-Fuller（ADF） method. Research shows that the inherent relevance between the ship equipment maintenance cost and price index is a long-term stable equilibrium， but the price change influence on ship equipment maintenance cost exists the lagging.