详细回答见内

如果你一年前的H1是占名额H1，而从你上一个h1批准日期算起，6年以内，只要你一直以合法身份呆在美国，如果你再次需要h1工作，这个h1是不占当年名额的。也就是你可以随时提交h1申请，批准就可以上班，不必要等4月1号递交和10月1号生效。下面是我在官方网站找到的相关信息。希望对你有帮助。

ｕｓｃｉｓ　官方网站的信息。
http://www.uscis.gov/files/nativedocuments/H1B_FY05_Characteristics.pdf


请看第四页的第二段：
When the H-1B category was enacted in 1990, Congress established that a maximum of 65,000 H-1B visas may be issued to aliens during each fiscal year. This limitation, commonly referred to as the"H-1B cap", does not apply to H-1B petitions filed on behalf of aliens who have been counted against the cap in the previous six years and who have not been outside of the United States for one year or longer. Thus, generally, petitions to extend an H-1B nonimmigrant's period of stay, change the conditions of the H-1B nonimmigrant's current employemnt, or request new H-1B employment filed on behalf of H-1B workers already in the United States will not count against the H-1B fiscal year cap.