The actual problem of the movement trajectory choice by the mobile robotic complex under an uncertain environment is considered. Approach to the decision of this problem in terms of fuzzy sets theory and utility theory is suggested, that allows to take into account specific peculiarities of the task (an uncertain environment), to bring into decision-making algorithm knowledge of the expert and easily formalize it. Suggested approach is based on the application of a known method of alternatives choice under an uncertain environment conditions to the decision of similar tasks. Considered approach is illustrated by the example.