两者交易都与沪港通Shanghai-Hong Kong Stock Connect与深港通机制Shenzhen-Hong Kong Stock Connect有关。

沪港通

The Shanghai-Hong Kong Stock Connect was officially launched in 2014. The stock connect established a two-way trading link between the Shanghai Stock Exchange (SSE) and the Stock Exchange of Hong Kong Limited (SEHK), a wholly-owned subsidiary of Hong Kong Exchanges and Clearing Limited (HKEX).

深港通

Shenzhen-Hong Kong Stock Connect (SEHKSZSE) (Chinese: 深港通) is a cross-boundary investment channel that connects the Shenzhen Stock Exchange and the Hong Kong Stock Exchange. Under the program, investors in each market are able to trade shares on the other market using their local brokers and clearing houses.

北向交易与南向交易与沪深两大交易所与香港联交所的位置关系而得名。无论是北向交易还是南向交易，其可以投资的股票范围都是受到限制的：

北向交易是指境外投资者通过沪港通、深港通机制来交易沪深两两市的股票。对应的资金叫做北向资金。北向交易的标的证券范围为。A+H股，上证180指数成分股、上证380指数成分股、市值60亿人民币以上的深证成分指数股票、市值60亿人民币以上的深证中小创指数股票。

南向交易是指境内投资者通过沪港通、深港通机制来交易港交所的股票，对应的资金叫做南向资金。南向交易的标的证券范围为。恒深综合大型股指数的成分股、恒深综合中型股指数成分股、市值50亿港元以上的恒深综合小型股指数、同时在上交所和港交所上市的A+H股、同时在深交所和港交所上市的A+H股。

北向交易和南向交易的英文则分别是northbound trading和southbound trading：

The stocks in Southbound Trading are traded by Mainland investors in in Hong Kong dollar only and settle the trades with ChinaClear or its clearing participants in Renminbi. The stocks in Northbound Trading are traded and settled in Renminbi by local and overseas investors.

以下为相关双语示例，供参考：

根据《规定》修订说明，近年来，有部分内地投资者在香港开立证券账户及北向交易权限，通过沪深股通交易A股。目前此类交易总体规模不大，交易金额在北向交易中的占比保持在1%左右。

According to the revised instructions of the Regulations, in recent years, some mainland investors have opened securities accounts and northbound trading access in Hong Kong, and traded A shares through Shanghai and Shenzhen Stock Connect. At present, the overall scale of such transactions is small, and the transaction amount accounts for about 1% of northbound transactions.