JAS-39 Gryphon fighter is a light, single-shot and multi-purpose fighter developed by Saab Company of Sweden, which is used to replace Saab-37 \" Dragon\" and Saab-37 \" Thunder\" of Swedish Air Force. Gryphon fighter is composed of canard wing ( front wing ) and delta wing to form short-range coupled canard layout. It belongs to the fourth generation fighter ( formerly called the third generation ). Because of its good performance, it has also been called four and a half generations, which means advanced performance than the fourth generation fighter such as F-16 fighter. The abbreviation of \" JAS\" of JAS-39 fighter is the abbreviation of \" Jakt\", \" Attack\" and \" Spy\" in Swedish, so JAS-39 fighter is a multi-purpose fighter with both combat, attack and reconnaissance. JAS-39 inherits the aerodynamic type of Saab-37 fighter, and widely adopts composite materials. The main wing is tangential delta wing with leading edge flap and leading edge serrated, and the fully moving front wing is located on both sides of rectangular culvert without horizontal tail. The leading edge swept angles of the wing and the front wing are 45 ° and 43 ° respectively. The aircraft can achieve supersonic flight at all altitudes and achieve maximum efficiency in short-field take-off and landing.