The present invention relates to flame retardant fabrics and safety apparel, especially yarn used for high flame resistant safety apparel fabric, the yarn uses a cheese method; the yarn is used to weave fabric. The fabric as described contains at least 60% high flame resistant modacrylic fiber, after cheese dyeing, weave the fabric, the safety apparel use this fabric will not continue to burn after leaving the fire, will no melt and will not cause the wearer secondary injury, comply with the relevant standards of the European Union, the United States, and China.