The　ability　to　resist　the　effect　of　wind　disturbance　is　vital　for　micro　air　vehicles.　As　the　most　compact　rotor　configuration　for　micro　air　vehicles,　coaxial　rotors　will　be　the　preferred　choice　for　this　type　of　devices.　In　this　paper,　the　aerodynamic　performance　of　the　coaxial　rotors　considering　the　wind　gust　is　presented　with　both　experiments　and　simulations.　First,　effect　of　wind　disturbances　on　the　micro　air　vehicles　flight　was　introduced.　Then,　low-speed　wind　tunnel　tests　were　performed　on　a　coaxial　rotor　with　a　spacing　0.39　R　to　obtain　the　performance　in　both　horizontal　and　vertical　wind　of　0–5　m/s　with　the　revolutions　per　minute　ranging　from　1500　to　2400.　Finally,　computational　fluid　dynamics　simulations,　as　a　means　of　visualizing　the　flow　field　to　compensate　the　intuition　of　the　experimental　data,　were　applied　by　using　the　sliding　mesh　to　capture　the　detailed　interference　of　flow　field　with　the　distributions　of　streamline　and　velocity　vector.　Compared　with　wind　tunnel　tests,　simulation　results　were　highly　consistent　with　experiments　that　allow　to　capture　the　flow　details　around　the　rotor　tip　effectively.　In　addition,　the　aerodynamic　performance　was　deteriorated　by　vortices　moving　or　deforming　around　the　blade　tip.　Also,　coaxial　rotors　can　effectively　resist　the　wind　disturbance　in　the　horizontal　direction　while　the　rotor　performance　was　found　to　be　declined　in　the　vertical　wind.　©　The　Author(s)　2019.