Australian shares are expected to open higher despite mixed results on Wall Street overnight.

The SPI200 futures contract was up 20 points, or 0.32 per cent, at 6,324.0 at 0800 AEST, suggesting a positive start for the benchmark S&P/ASX200 on Wednesday.

On Wall Street, the Dow Jones Industrial Average was up 0.15 per cent, the S&P 500 was up 0.10 per cent and the tech-heavy Nasdaq Composite was down 0.81 per cent.

The Aussie dollar is buying 70.48 US cents from 70.37 US cents on Tuesday.