Wind　disturbance　posed　difficulties　for　the　stability　of　the　micro　air　vehicles　(MAVs)　with　attitude　variation.　In　this　paper,　the　aerodynamic　performance　of　a　MAV　with　six　coaxial　rotor　pairs　considering　the　horizontal　wind　is　investigated　by　both　experiments　and　numerical　simulations.　First,　the　effect　of　the　horizontal　wind　on　the　multi‐rotor　aircraft　is　analyzed　in　detail.　Then,　low-speed　wind　tunnel　tests　were　performed　to　obtain　the　thrust　and　power　consumption　and　the　aerodynamic　performance　of　the　multi‐rotor　aircraft　(l/D　=　1.2　and　h/D　=　0.19)　with　the　rotational　speed　of　1500–2300　r/min　in　the　horizontal　wind　ranged　from　0　to　5　m/s.　Finally,　the　distribution　of　streamline,　the　pressure　of　the　blade　tip,　and　the　velocity　and　the　vortices　in　the　flow　field　of　a　multi-rotor　aircraft　with　horizontal　wind　disturbance,　were　simulated　and　studied　using　the　computational　fluid　dynamics　(CFD)　method.　Through　the　comparison　of　experimental　results　and　simulation　results,　it　can　be　seen　that　the　horizontal　wind　disturbance　will　increase　power　consumption　to　weaken　the　aerodynamic　performance　at　higher　rotor　speeds.　However,　larger　thrust　and　better　hover　performance　are　obtained　at　lower　rotational　speeds　with　good　wind　resistance.　Additionally,　due　to　the　mutual　induction　between　rotor　wakes,　the　interactions　of　downwash　flows　become　more　intense　at　higher　rotational　speeds　or　larger　wind　speeds　where　the　vortexes　at　the　blade　tip　deformed　and　moved　along　with　the　wind.　©　2020　by　the　authors.　Licensee　MDPI,　Basel,　Switzerland.